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class="post-meta-date-created" datetime="2021-01-15T04:10:03.134Z" title="发表于 2021-01-15 12:10:03">2021-01-15</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-04-19T12:46:22.985Z" title="更新于 2021-04-19 20:46:22">2021-04-19</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Web%E5%89%8D%E7%AB%AF/">Web前端</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Web%E5%89%8D%E7%AB%AF/JavaScript/">JavaScript</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">3.1k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>14分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="JavaScript🌞BOM"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div><article class="post-content" id="article-container"><h1 id="BOM"><a href="#BOM" class="headerlink" title="BOM"></a>BOM</h1><ul>
<li>JS组成<ol>
<li><code>ECMAScript</code>：JS基本语法、数组、函数和对象。</li>
<li><code>BOM</code>：浏览器对象模型（Brower Object Model）。</li>
<li><code>DOM</code>：文档对象模型（Document Object Model )。</li>
</ol>
</li>
<li>BOM作用及结构图<ol>
<li>浏览器对象：内置对象，实现JS操作浏览器窗口及窗口上的控件，实现用户和页面的动态交互。</li>
<li>BOM：浏览器对象模型。</li>
</ol>
</li>
</ul>
<img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/fde59ae943452104dec1eb6697a007dc.png" width="50%">

<h1 id="window"><a href="#window" class="headerlink" title="window"></a>window</h1><ul>
<li><code>window</code>对象是BOM中所有对象的核心，同时也是BOM中所有对象的父对象。</li>
<li>全局变量、函数、内置对象均能被window对象调用。</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> area = <span class="string">&#x27;Beijing&#x27;</span>;</span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">getArea</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">   <span class="keyword">return</span> <span class="built_in">this</span>.area;</span><br><span class="line">&#125;</span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">window</span>.area);        <span class="comment">//访问变量，输出结果：Beijing</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">window</span>.area());		<span class="comment">//访问window对象的属性，输出结果为：Beijing</span></span><br><span class="line"><span class="built_in">console</span>.log(getArea());  <span class="comment">//调用自定义函数，输出结果：Beijing</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">window</span>.getArea());  <span class="comment">//调用window对象的方法，输出结果：Beijing</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">window</span>.Number(area));  <span class="comment">//调用内置函数，将变量area转换为数值型，输出结果：NaN</span></span><br></pre></td></tr></table></figure>

<ul>
<li><p>定义在全局作用域中的<code>getArea()</code>函数，函数体内的<code>this</code>关键字指向<code>window</code>对象。</p>
</li>
<li><p>对于window对象的属性和方法在调用时可以省略window，直接访问其属性和方法即可。</p>
</li>
<li><p>弹出对话框和窗口</p>
</li>
</ul>
<img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/f7c0de03573b5943357e4e28d54fe66a.png" width="70%">

<img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/a5afa659fcf7196d587d016fcac0b3bc.png" width="70%">

<ul>
<li>输入对话框</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> str=prompt(<span class="string">&#x27;请输入测试的选项&#x27;</span>,<span class="string">&#x27;用户名和密码&#x27;</span>);</span><br></pre></td></tr></table></figure>

<ul>
<li>确认对话框</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;input type=<span class="string">&quot;button&quot;</span> value=<span class="string">&quot;删除&quot;</span> onclick=<span class="string">&quot;del()&quot;</span>&gt;</span><br><span class="line">&lt;script&gt;</span><br><span class="line">   <span class="function"><span class="keyword">function</span> <span class="title">del</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">   <span class="function"><span class="title">if</span>(<span class="params">confirm(<span class="string">&#x27;确定要删除吗？&#x27;</span>)</span>)</span>&#123;</span><br><span class="line">      <span class="comment">//你按下了“确定”按钮</span></span><br><span class="line">   &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">      <span class="comment">//你按下了“取消”按钮</span></span><br><span class="line">   &#125;</span><br><span class="line">   &#125;</span><br><span class="line">&lt;/script&gt;</span><br></pre></td></tr></table></figure>

<ul>
<li>打开与关闭窗口</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">open(URL,name,specs,replace);</span><br><span class="line"><span class="comment">//name指定target属性或窗口的名称</span></span><br><span class="line"><span class="comment">//specs设置浏览器窗口的特征（如大小、位置）</span></span><br><span class="line"><span class="comment">//replace设置为true，表示替换浏览器历史中的当前条目,设置为false(默认值)，表示在浏览历史中创建新的条目</span></span><br></pre></td></tr></table></figure>

<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;utf-8&quot;</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">&quot;X-UA-Compatible&quot;</span> <span class="attr">content</span>=<span class="string">&quot;IE=edge&quot;</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">title</span>&gt;</span><span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">link</span> <span class="attr">rel</span>=<span class="string">&quot;stylesheet&quot;</span> <span class="attr">href</span>=<span class="string">&quot;&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">h2</span>&gt;</span>这是第一个页面<span class="tag">&lt;/<span class="name">h2</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">&quot;test1 windowd对象的属性和方法_submit&quot;</span> <span class="attr">method</span>=<span class="string">&quot;get&quot;</span> <span class="attr">accept-charset</span>=<span class="string">&quot;utf-8&quot;</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">name</span>=<span class="string">&quot;&quot;</span> <span class="attr">value</span>=<span class="string">&quot;打开窗口&quot;</span> <span class="attr">onclick</span>=<span class="string">&quot;openWin()&quot;</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">      <span class="comment">//第一组：对话框</span></span></span><br><span class="line"><span class="javascript">      <span class="comment">// window.alert(&quot;alert&quot;);</span></span></span><br><span class="line"><span class="javascript">      <span class="comment">// console.log(&quot;confirm:&quot; + window.confirm(&quot;confirm&quot;));  //观察点击”确认“和”取消“两种情况的输出结果</span></span></span><br><span class="line"><span class="javascript">      <span class="comment">// console.log(&quot;prompt:&quot; +  window.prompt(&quot;prompt&quot;,100));</span></span></span><br><span class="line"></span><br><span class="line"><span class="javascript">      <span class="comment">//第二组：窗口的打开与关闭</span></span></span><br><span class="line"><span class="javascript">      <span class="function"><span class="keyword">function</span> <span class="title">openWin</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">       <span class="built_in">window</span>.open(<span class="string">&quot;test1 第二个页面.html&quot;</span>,<span class="string">&quot;_blank&quot;</span>,<span class="string">&#x27;width=400,height=200,left=200&#x27;</span>);</span></span><br><span class="line">      &#125;</span><br><span class="line">   <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li> 窗口位置和大小</li>
</ul>
<img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/b12c6d694892607202cbe6b6c8f4b4d2.png" width="70%">

<img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/e1c6f927ee07c68790ff6149ba98f6fd.png" width="70%">

<h2 id="定时器"><a href="#定时器" class="headerlink" title="定时器"></a>定时器</h2><ul>
<li>通过window对象提供的方法实现在指定时间后执行特定操作，也可以让程序代码每隔一段时间执行一次，实现间歇操作。</li>
</ul>
<table>
<thead>
<tr>
<th align="center">方法</th>
<th align="center">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><code>setTimeout()</code></td>
<td align="center">在指定的毫秒数后调用函数或执行一段代码</td>
</tr>
<tr>
<td align="center"><code>setInterval()</code></td>
<td align="center">按照指定的周期(以毫秒计)来调用函数或执行一段代码</td>
</tr>
<tr>
<td align="center"><code>clearTimeout()</code></td>
<td align="center">取消由setTimeout()方法设置的定时器</td>
</tr>
<tr>
<td align="center"><code>clearInterval()</code></td>
<td align="center">取消由setInterval()方法设置的定时器</td>
</tr>
</tbody></table>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//一次性定时器</span></span><br><span class="line"><span class="keyword">var</span> timer = <span class="built_in">window</span>.setTimeout(echoStr,<span class="number">3000</span>); <span class="comment">//echoStr定时调用的函数,3000为时间，单位毫秒</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">echoStr</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">   <span class="built_in">console</span>.log(<span class="string">&quot;Hello JS!&quot;</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="built_in">window</span>.clearTimeout(timer);</span><br><span class="line"> <span class="comment">//周期性定时器</span></span><br><span class="line"><span class="keyword">var</span> timer = <span class="built_in">window</span>.setInterval(echoStr,<span class="number">3000</span>);       </span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">echoStr</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">   <span class="built_in">console</span>.log(<span class="string">&quot;Hello JS!&quot;</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="built_in">window</span>.clearInterval(timer);</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span> <span class="meta-keyword">PUBLIC</span> <span class="meta-string">&quot;-//W3C//DTD XHTML 1.0 Transitional//EN&quot;</span> <span class="meta-string">&quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span> <span class="attr">xmlns</span>=<span class="string">&quot;http://www.w3.org/1999/xhtml&quot;</span> <span class="attr">xml:lang</span>=<span class="string">&quot;en&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">&quot;Content-Type&quot;</span> <span class="attr">content</span>=<span class="string">&quot;text/html;charset=UTF-8&quot;</span> /&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">title</span>&gt;</span>Document<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">style</span> <span class="attr">type</span>=<span class="string">&quot;text/css&quot;</span>&gt;</span></span><br><span class="line"><span class="css">      <span class="selector-tag">div</span>&#123;<span class="attribute">width</span>:<span class="number">50px</span>;<span class="attribute">height</span>:<span class="number">50px</span>;<span class="attribute">border</span>:<span class="number">1px</span> solid <span class="number">#ccc</span>;<span class="attribute">margin-left</span>:<span class="number">5px</span>;<span class="attribute">line-height</span>:<span class="number">50px</span>;<span class="attribute">text-align</span>: center;<span class="attribute">color</span>:red;&#125;</span></span><br><span class="line">   <span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">&quot;timeDiv&quot;</span>&gt;</span>0<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">form</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">value</span> = <span class="string">&quot;开始&quot;</span> <span class="attr">id</span>=<span class="string">&quot;start&quot;</span>/&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">value</span> = <span class="string">&quot;暂停&quot;</span> <span class="attr">id</span>=<span class="string">&quot;pause&quot;</span>/&gt;</span></span><br><span class="line">   <span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> start = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;start&#x27;</span>);</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> pause = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;pause&#x27;</span>);</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> timeDiv = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;timeDiv&#x27;</span>);</span></span><br><span class="line"><span class="javascript">       <span class="keyword">var</span> time = <span class="number">0</span>;</span></span><br><span class="line"></span><br><span class="line"><span class="javascript">      start.onclick = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">         timer = <span class="built_in">window</span>.setInterval(startFun, <span class="number">1000</span>);</span></span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line"><span class="javascript">      pause.onclick = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">         <span class="built_in">window</span>.clearInterval(timer);</span></span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line"><span class="javascript">      <span class="function"><span class="keyword">function</span> <span class="title">startFun</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line">         time++;</span><br><span class="line">         timeDiv.innerHTML = time;</span><br><span class="line">      &#125;</span><br><span class="line">   <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p><img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/3c71904f4ddcba4c36d76dcec829915a.png"></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>限时秒杀<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.box</span>&#123;<span class="attribute">margin</span>:<span class="number">0</span> auto;<span class="attribute">position</span>:relative;<span class="attribute">background</span>:<span class="built_in">url</span>(images/flash_sale.png);<span class="attribute">width</span>:<span class="number">702px</span>;<span class="attribute">height</span>:<span class="number">378px</span>;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.box</span> <span class="selector-tag">div</span>&#123;<span class="attribute">float</span>:left;<span class="attribute">width</span>:<span class="number">50px</span>;<span class="attribute">height</span>:<span class="number">50px</span>;<span class="attribute">border</span>:<span class="number">1px</span> solid <span class="number">#ccc</span>;<span class="attribute">margin-left</span>:<span class="number">5px</span>;<span class="attribute">line-height</span>:<span class="number">50px</span>;<span class="attribute">text-align</span>: center;<span class="attribute">color</span>:red;<span class="attribute">position</span>:relative;<span class="attribute">top</span>:<span class="number">260px</span>;<span class="attribute">left</span>:<span class="number">305px</span>;&#125;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">&quot;s&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span>        <span class="comment">&lt;!-- 剩余的秒数 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> s = <span class="number">5</span>;</span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> timer = <span class="built_in">window</span>.setInterval(myFun,<span class="number">1000</span>);</span></span><br><span class="line"><span class="javascript">      <span class="function"><span class="keyword">function</span> <span class="title">myFun</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">           <span class="built_in">document</span>.getElementById(<span class="string">&#x27;s&#x27;</span>).innerHTML = s + <span class="string">&#x27;秒&#x27;</span>;</span></span><br><span class="line">           s--;</span><br><span class="line"><span class="javascript">           <span class="function"><span class="title">if</span>(<span class="params">s&lt;<span class="number">0</span></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="built_in">window</span>.clearInterval(timer);</span></span><br><span class="line">           &#125;</span><br><span class="line">      &#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p><img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/fc3bf46530e987d249f98c6db03ca728.png"></p>
<h1 id="location"><a href="#location" class="headerlink" title="location"></a>location</h1><ul>
<li>localtion对象可以更改当前用户中浏览器中访问的URL，实现新文档的载入、重载以及替换等功能。</li>
<li>每一个网页文件都有一个访问标记符，用于唯一标识它的访问位置，以便浏览器可以访问的，这个访问标记符称为URL(Uniform Resource Locator,统一资源定位符)。URL中包含了网络协议、服务器的主机名、端口号、资源名称字符串、参数以及锚点</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">http:&#x2F;&#x2F;www.example.com:80&#x2F;web&#x2F;index.html?a&#x3D;3&amp;b&#x3D;4#res</span><br></pre></td></tr></table></figure>


<ul>
<li>更改URL</li>
</ul>
<table>
<thead>
<tr>
<th align="center">location对象的方法</th>
<th align="center">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><code>assign()</code></td>
<td align="center">载入一个新的文档</td>
</tr>
<tr>
<td align="center"><code>reload()</code></td>
<td align="center">重新载入当前文档</td>
</tr>
<tr>
<td align="center"><code>replace</code></td>
<td align="center">用新的文档替换当前文档</td>
</tr>
</tbody></table>
<blockquote>
<p>reload() 参数为true时，它会绕过缓存，从服务器上重新下载该文档，类似于浏览器中的刷新页面按钮</p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line">   <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">value</span>=<span class="string">&quot;载入新页面&quot;</span> <span class="attr">onclick</span>=<span class="string">&quot;newPage()&quot;</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">value</span>=<span class="string">&quot;刷新页面&quot;</span> <span class="attr">onclick</span>=<span class="string">&quot;freshPage()&quot;</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">value</span>=<span class="string">&quot;替换页面&quot;</span> <span class="attr">onclick</span>=<span class="string">&quot;replacePage()&quot;</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">p</span> <span class="attr">id</span>=<span class="string">&quot;time&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">   <span class="comment">//获取并显示当前页面载入的时间</span></span></span><br><span class="line"><span class="javascript">   <span class="keyword">var</span> ds=<span class="keyword">new</span> <span class="built_in">Date</span>();</span></span><br><span class="line"><span class="javascript">   <span class="keyword">var</span> d=ds.getDate();</span></span><br><span class="line"><span class="javascript">   <span class="built_in">document</span>.getElementById(<span class="string">&#x27;time&#x27;</span>).innerHTML=t;</span></span><br><span class="line"><span class="javascript">   <span class="comment">//载入新的页面</span></span></span><br><span class="line"><span class="javascript">   <span class="function"><span class="keyword">function</span> <span class="title">newPage</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">      <span class="built_in">window</span>.location.assign(<span class="string">&#x27;http://www.baidu.com&#x27;</span>);</span></span><br><span class="line">   &#125;</span><br><span class="line"><span class="javascript">    <span class="comment">//刷新页面        </span></span></span><br><span class="line"><span class="javascript">   <span class="function"><span class="keyword">function</span> <span class="title">freshPage</span>(<span class="params"></span>)</span>&#123;          </span></span><br><span class="line"><span class="javascript">      <span class="built_in">window</span>.location.reload(<span class="literal">true</span>);</span></span><br><span class="line">   &#125;</span><br><span class="line"><span class="javascript">   <span class="comment">//替换，不能后退</span></span></span><br><span class="line"><span class="javascript">   <span class="function"><span class="keyword">function</span> <span class="title">replace</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">      <span class="built_in">window</span>.location.replace(‘http:<span class="comment">//www.baidu.com’);  </span></span></span><br><span class="line">   &#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li>获取URL参数</li>
</ul>
<table>
<thead>
<tr>
<th align="center">属性</th>
<th align="center">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center"><code>search</code></td>
<td align="center">返回URL地址中的参数</td>
</tr>
<tr>
<td align="center"><code>hash</code></td>
<td align="center">返回一个URL的锚部分</td>
</tr>
<tr>
<td align="center"><code>host</code></td>
<td align="center">返回一个URL的主机名和端口</td>
</tr>
<tr>
<td align="center"><code>hostname</code></td>
<td align="center">返回URL的主机名</td>
</tr>
<tr>
<td align="center"><code>href</code></td>
<td align="center">返回完整的主机名</td>
</tr>
<tr>
<td align="center"><code>pathname</code></td>
<td align="center">返回URL的路径名</td>
</tr>
<tr>
<td align="center"><code>port</code></td>
<td align="center">返回一个URL服务器使用的端口号</td>
</tr>
<tr>
<td align="center"><code>protocol</code></td>
<td align="center">返回一个URL协议</td>
</tr>
</tbody></table>
<ul>
<li>获取URL的指定部分：<code>location.属性名</code></li>
<li>设置URL的指定部分：<code>location.属性名 = 值</code></li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//假设用户在地址栏中访问:http://localhost/search.html?goods=books&amp;price=40</span></span><br><span class="line">location.search;  <span class="comment">//获取:&quot;?goods=books&amp;price=40&quot;</span></span><br><span class="line"><span class="comment">//获取URL地址</span></span><br><span class="line">location.href;</span><br><span class="line"><span class="comment">//设置URL地址</span></span><br><span class="line">location.href=<span class="string">&quot;http://www.baidu.com&quot;</span>;</span><br></pre></td></tr></table></figure>

<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>定时跳转<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="css">      <span class="selector-tag">body</span>&#123;<span class="attribute">background</span>:gray;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-tag">div</span>&#123;<span class="attribute">margin</span>:<span class="number">20px</span> auto;<span class="attribute">width</span>:<span class="number">350px</span>;<span class="attribute">height</span>:<span class="number">150px</span>;<span class="attribute">border</span>:<span class="number">1px</span> solid <span class="number">#000</span>;<span class="attribute">background</span>:white;<span class="attribute">padding</span>:<span class="number">10px</span>;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-tag">h2</span>&#123;<span class="attribute">text-align</span>:center;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-tag">span</span>&#123;<span class="attribute">font-size</span>:<span class="number">150%</span>;<span class="attribute">color</span>:red;<span class="attribute">margin</span>:<span class="number">0</span> <span class="number">10px</span>;&#125;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">h2</span>&gt;</span>提交成功<span class="tag">&lt;/<span class="name">h2</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;http://www.baidu.com&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">span</span> <span class="attr">id</span>=<span class="string">&quot;seconds&quot;</span>&gt;</span>3<span class="tag">&lt;/<span class="name">span</span>&gt;</span>秒后系统会自动跳转，也可单击此链接跳转</span><br><span class="line">      <span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">     <span class="function"><span class="keyword">function</span> <span class="title">timing</span>(<span class="params">secs,url</span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">			<span class="keyword">var</span> seconds=<span class="built_in">document</span>.getElementById(<span class="string">&#x27;seconds&#x27;</span>);</span></span><br><span class="line">			seconds.innerHTML=--secs;</span><br><span class="line"><span class="javascript">		<span class="function"><span class="title">if</span>(<span class="params">secs&gt;<span class="number">0</span></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">			  <span class="built_in">setTimeout</span>(<span class="string">&#x27;timing(&#x27;</span>+secs+<span class="string">&#x27;,\&#x27;&#x27;</span>+url+<span class="string">&#x27;\&#x27;)&#x27;</span>,<span class="number">1000</span>); </span></span><br><span class="line"><span class="javascript">		&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line">			 location.href=url;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;;</span><br><span class="line"><span class="javascript">	timing(<span class="number">3</span>,<span class="string">&#x27;http://www.baidu.com&#x27;</span>);</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p><img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/6ce17e2ba00d43144f24cacf7fbb696a.png"></p>
<h1 id="history"><a href="#history" class="headerlink" title="history"></a>history</h1><ul>
<li>history对象可以对用户在浏览器中访问过的URL历史记录进行操作。但history不能直接获取用户浏览过的URL</li>
</ul>
<p><img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/94c388f221c2b7c8d15a47bcd46fabd6.png"></p>
<ul>
<li><code>go()</code>方法：当参数值是一个负整数时，表示“后退”指定的页数；当参数值是一个正整数时，表示“前进”指定的页数。</li>
<li>当go()方法的参数为1或-1时，与<code>forward()</code>和<code>back()</code>方法的作用相同。</li>
</ul>
<p><img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/0563d51aaf7af1fa4858b0b3fef727fc.png"></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre></td><td class="code"><pre><span class="line">//第一个页面</span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>定时跳转<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">       <span class="tag">&lt;<span class="name">h1</span>&gt;</span>这是第一个页面<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span><br><span class="line">       <span class="tag">&lt;<span class="name">form</span>&gt;</span></span><br><span class="line">           <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">value</span>=<span class="string">&quot;前进&quot;</span> <span class="attr">id</span>=<span class="string">&quot;qianjin&quot;</span>/&gt;</span></span><br><span class="line">           <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">value</span>=<span class="string">&quot;打开新页面&quot;</span> <span class="attr">id</span>=<span class="string">&quot;dakai&quot;</span> /&gt;</span></span><br><span class="line">       <span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line"></span><br><span class="line">       <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">           <span class="keyword">var</span> qianjin = <span class="built_in">document</span>.getElementById(<span class="string">&quot;qianjin&quot;</span>);</span></span><br><span class="line"><span class="javascript">           qianjin.onclick = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="built_in">window</span>.history.forward();  <span class="comment">//window.history.go(1);</span></span></span><br><span class="line">           &#125;</span><br><span class="line"></span><br><span class="line"><span class="javascript">           <span class="keyword">var</span> dakai = <span class="built_in">document</span>.getElementById(<span class="string">&quot;dakai&quot;</span>);</span></span><br><span class="line"><span class="javascript">           dakai.onclick = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="built_in">window</span>.location.assign(<span class="string">&quot;u6 前进和后退2.html&quot;</span>);</span></span><br><span class="line">           &#125;</span><br><span class="line">       <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br><span class="line"></span><br><span class="line">//第二个页面</span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>定时跳转<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">       <span class="tag">&lt;<span class="name">h2</span>&gt;</span>这是第二个页面<span class="tag">&lt;/<span class="name">h2</span>&gt;</span></span><br><span class="line">       <span class="tag">&lt;<span class="name">form</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;button&quot;</span> <span class="attr">id</span>=<span class="string">&quot;houtui&quot;</span> <span class="attr">value</span>=<span class="string">&quot;后退&quot;</span>/&gt;</span></span><br><span class="line">       <span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line"></span><br><span class="line">       <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">           <span class="keyword">var</span> houtui = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;houtui&#x27;</span>);</span></span><br><span class="line"><span class="javascript">           houtui.onclick = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="built_in">window</span>.history.back();</span></span><br><span class="line">           &#125;</span><br><span class="line">       <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p><img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/cc6d3cf4bfe42d635f73f20bd8663e9f.png"></p>
<h1 id="navigator"><a href="#navigator" class="headerlink" title="navigator"></a>navigator</h1><ul>
<li>navigator对象提供了有关浏览器的信息。</li>
</ul>
<img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/02f974b05a95d0f7da7eb30125bacd35.png" width="60%">

<h1 id="screen"><a href="#screen" class="headerlink" title="screen"></a>screen</h1><ul>
<li>返回当前渲染窗口中与屏幕相关的属性信息，如屏幕的宽度和高度等。</li>
</ul>
<img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/8aa35d76cbc9fc6e0eac08b9045ac9cd.png" width="60%">

<h1 id="红绿灯倒计时"><a href="#红绿灯倒计时" class="headerlink" title="红绿灯倒计时"></a>红绿灯倒计时</h1><p><img src="https://cdn.jsdelivr.net/gh/lzyblog/image@main/2020/12/22/b6f3e06ee4682dfae9a3b4f8a1d57724.png"></p>
<ul>
<li>分析红绿灯：<br>  ① 横向三色交通信号灯的亮灯的顺序一般为“绿-&gt;黄-&gt;红-&gt;绿”依次循环。<br>  ② 亮灯时长需根据路口的实际情况等因素来考虑设置，如红灯亮设置为3秒，绿灯亮设置为5秒，黄灯亮设置为3秒。<br>核心功能：  改变背景颜色 + 倒计时</li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span 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class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>红绿灯倒计时<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.box</span>&#123;<span class="attribute">width</span>:<span class="number">250px</span>;<span class="attribute">height</span>:<span class="number">52px</span>;<span class="attribute">padding</span>:<span class="number">15px</span> <span class="number">30px</span>;<span class="attribute">border</span>:<span class="number">2px</span> solid <span class="number">#ccc</span>;<span class="attribute">border-radius</span>:<span class="number">16px</span>;<span class="attribute">margin</span>:<span class="number">0</span> auto;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.box</span> <span class="selector-class">.count</span>&#123;<span class="attribute">width</span>:<span class="number">60px</span>;<span class="attribute">color</span>:<span class="number">#666</span>;<span class="attribute">font-size</span>:<span class="number">280%</span>;<span class="attribute">line-height</span>:<span class="number">50px</span>;<span class="attribute">padding-left</span>:<span class="number">6px</span>;<span class="attribute">margin-left</span>:<span class="number">5px</span>;<span class="attribute">border</span>:<span class="number">1px</span> solid <span class="number">#fff</span>&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.box</span> <span class="selector-tag">div</span>&#123;<span class="attribute">margin-left</span>:<span class="number">5px</span>;<span class="attribute">float</span>:left;<span class="attribute">width</span>:<span class="number">50px</span>;<span class="attribute">height</span>:<span class="number">50px</span>;<span class="attribute">border-radius</span>:<span class="number">50px</span>;<span class="attribute">border</span>:<span class="number">1px</span> solid <span class="number">#666</span>;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.gray</span>&#123;<span class="attribute">background-color</span>:<span class="number">#eee</span>;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.red</span>&#123;<span class="attribute">background-color</span>:red;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.yellow</span>&#123;<span class="attribute">background-color</span>:yellow;&#125;</span></span><br><span class="line"><span class="css">      <span class="selector-class">.green</span>&#123;<span class="attribute">background-color</span>:<span class="number">#26ff00</span>;&#125;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">  //编写HTML页面</span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">&quot;red&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">&quot;yellow&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">&quot;green&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;count&quot;</span> <span class="attr">id</span>=<span class="string">&quot;count&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">      <span class="comment">// 获取红、黄、绿灯以及倒计时的元素对象</span></span></span><br><span class="line"><span class="javascript">      <span class="comment">//lamp：整个红绿灯对象</span></span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> lamp = &#123;</span></span><br><span class="line"><span class="javascript">        red: &#123;  <span class="comment">//red:lamp的成员,红灯对象</span></span></span><br><span class="line"><span class="javascript">          obj: <span class="built_in">document</span>.getElementById(<span class="string">&#x27;red&#x27;</span>), <span class="comment">//obj:存储信号灯的元素对象</span></span></span><br><span class="line"><span class="javascript">          timeout: <span class="number">3</span>,    <span class="comment">//信号灯剩余亮灯时间</span></span></span><br><span class="line"><span class="javascript">          style: [<span class="string">&#x27;red&#x27;</span>, <span class="string">&#x27;gray&#x27;</span>, <span class="string">&#x27;gray&#x27;</span>],  <span class="comment">//当红灯亮起时，红、黄、绿信号灯的背景颜色</span></span></span><br><span class="line"><span class="javascript">          next: <span class="string">&#x27;green&#x27;</span> <span class="comment">//红灯之后亮起的信号灯</span></span></span><br><span class="line">        &#125;,</span><br><span class="line">        yellow: &#123;</span><br><span class="line"><span class="javascript">          obj: <span class="built_in">document</span>.getElementById(<span class="string">&#x27;yellow&#x27;</span>),</span></span><br><span class="line">          timeout: 3,</span><br><span class="line"><span class="javascript">          style: [<span class="string">&#x27;gray&#x27;</span>, <span class="string">&#x27;yellow&#x27;</span>, <span class="string">&#x27;gray&#x27;</span>],</span></span><br><span class="line"><span class="javascript">          next: <span class="string">&#x27;red&#x27;</span></span></span><br><span class="line">        &#125;,</span><br><span class="line">        green: &#123;</span><br><span class="line"><span class="javascript">          obj: <span class="built_in">document</span>.getElementById(<span class="string">&#x27;green&#x27;</span>),</span></span><br><span class="line">          timeout: 5,</span><br><span class="line"><span class="javascript">          style: [<span class="string">&#x27;gray&#x27;</span>, <span class="string">&#x27;gray&#x27;</span>, <span class="string">&#x27;green&#x27;</span>],</span></span><br><span class="line"><span class="javascript">          next: <span class="string">&#x27;yellow&#x27;</span></span></span><br><span class="line">        &#125;,</span><br><span class="line"><span class="javascript">        <span class="comment">//创建红绿灯对象（增加设置信号灯背景颜色的函数）</span></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="title">changeStyle</span>(<span class="params">style</span>)</span> &#123;</span></span><br><span class="line"><span class="javascript">          <span class="built_in">this</span>.red.obj.className = style[<span class="number">0</span>];  <span class="comment">//根据参数，更改obj的样式名称，实现更改背景颜色</span></span></span><br><span class="line"><span class="javascript">          <span class="built_in">this</span>.yellow.obj.className = style[<span class="number">1</span>];</span></span><br><span class="line"><span class="javascript">          <span class="built_in">this</span>.green.obj.className = style[<span class="number">2</span>];</span></span><br><span class="line">        &#125;</span><br><span class="line">      &#125;;</span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> count = &#123;  <span class="comment">//根据参数，更改num的值，即更改倒计时时间</span></span></span><br><span class="line"><span class="javascript">        obj: <span class="built_in">document</span>.getElementById(<span class="string">&#x27;count&#x27;</span>),</span></span><br><span class="line"><span class="javascript">        change: <span class="function"><span class="keyword">function</span>(<span class="params">num</span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">          <span class="built_in">this</span>.obj.innerHTML = (num &lt; <span class="number">10</span>) ? (<span class="string">&#x27;0&#x27;</span> + num) : num;</span></span><br><span class="line">        &#125;</span><br><span class="line">      &#125;;</span><br><span class="line"><span class="javascript">      <span class="comment">//初始状态 -- 绿灯亮</span></span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> now = lamp.green;   <span class="comment">//用变量now记录当前状态</span></span></span><br><span class="line"><span class="javascript">      lamp.changeStyle(now.style);  <span class="comment">//设置信号灯的背景颜色</span></span></span><br><span class="line"><span class="javascript">      <span class="keyword">var</span> timeout = now.timeout; <span class="comment">//记录信号灯亮起时的时间</span></span></span><br><span class="line"><span class="javascript">      count.change(timeout); <span class="comment">//设置倒计时时间</span></span></span><br><span class="line"></span><br><span class="line"><span class="javascript">      <span class="comment">//改变时间 -- 定时器</span></span></span><br><span class="line"><span class="javascript">      <span class="built_in">window</span>.setInterval(myfun,<span class="number">1000</span>);</span></span><br><span class="line"></span><br><span class="line"><span class="javascript">      <span class="function"><span class="keyword">function</span> <span class="title">myfun</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">           timeout--;  <span class="comment">//倒计时</span></span></span><br><span class="line"><span class="javascript">           <span class="function"><span class="title">if</span>(<span class="params">timeout&gt;<span class="number">0</span></span>)</span>&#123;  <span class="comment">//倒计时时间未结束</span></span></span><br><span class="line"><span class="javascript">                 count.change(timeout);   <span class="comment">//，刷新页面</span></span></span><br><span class="line"><span class="javascript">           &#125;<span class="keyword">else</span>&#123;  <span class="comment">//倒计时时间结束</span></span></span><br><span class="line"><span class="javascript">                now = lamp[now.next];   <span class="comment">//切换信号灯颜色  -- 注意：不能写为 now = now.next;  这样是将一个字符串如yellow赋值给now；</span></span></span><br><span class="line">                lamp.changeStyle(now.style);</span><br><span class="line">                timeout = now.timeout;</span><br><span class="line">                count.change(timeout);</span><br><span class="line">           &#125;</span><br><span class="line">      &#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
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href="https://github.com/xiaoliblog" target="_blank" title="GitHub"><i class="iconfont icon-git card_icon_git"></i></a><a class="social-icon" href="https://blog.csdn.net/qq_43266250?spm=1010.2135.3001.5113" target="_blank" title="CSDN"><i class="iconfont icon-csdn card_icon_csdn"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn card-announcement-animation"></i><span>公告</span></div><div class="announcement_content">正在考研备考中💦</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#BOM"><span class="toc-number">1.</span> <span class="toc-text">BOM</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#window"><span class="toc-number">2.</span> <span class="toc-text">window</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%AE%9A%E6%97%B6%E5%99%A8"><span class="toc-number">2.1.</span> <span class="toc-text">定时器</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#location"><span class="toc-number">3.</span> <span class="toc-text">location</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#history"><span class="toc-number">4.</span> <span class="toc-text">history</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#navigator"><span class="toc-number">5.</span> <span class="toc-text">navigator</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#screen"><span class="toc-number">6.</span> <span class="toc-text">screen</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E7%BA%A2%E7%BB%BF%E7%81%AF%E5%80%92%E8%AE%A1%E6%97%B6"><span class="toc-number">7.</span> <span class="toc-text">红绿灯倒计时</span></a></li></ol></div></div><div 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      }
    },
    tex: {
      inlineMath: [ ['$','$'], ["\\(","\\)"]],
      tags: 'ams'
    },
    options: {
      renderActions: {
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              target.classList.add('mathjax-overflow')
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        }, '', false]
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  const script = document.createElement('script')
  script.src = 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js'
  script.id = 'MathJax-script'
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  document.head.appendChild(script)
} else {
  MathJax.startup.document.state(0)
  MathJax.texReset()
  MathJax.typeset()
}</script><script>if (document.getElementsByClassName('mermaid').length) {
  if (window.mermaidJsLoad) mermaid.init()
  else {
    getScript('https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.js').then(() => {
      window.mermaidJsLoad = true
      mermaid.initialize({
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      false && mermaid.init()
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}</script><script>(()=>{
  const $countDom = document.getElementById('twikoo-count')
  const init = () => {
    twikoo.init(Object.assign({
      el: '#twikoo-wrap',
      envId: 'xiaoliblog-8gj3j5045d5b0896',
      region: ''
    }, null))
  }

  const getCount = () => {
    twikoo.getCommentsCount({
      envId: 'xiaoliblog-8gj3j5045d5b0896',
      region: '',
      urls: [window.location.pathname],
      includeReply: false
    }).then(function (res) {
      $countDom.innerText = res[0].count
    }).catch(function (err) {
      console.error(err);
    });
  }

  const loadTwikoo = (bool = false) => {
    if (typeof twikoo === 'object') {
      init()
      bool && $countDom && setTimeout(getCount,0)
    } else {
      getScript('https://cdn.jsdelivr.net/npm/twikoo@1.3.0/dist/twikoo.all.min.js').then(()=> {
        init()
        bool && $countDom && setTimeout(getCount,0)
      })
    }
  }

  if ('Twikoo' === 'Twikoo' || !true) {
    if (true) btf.loadComment(document.getElementById('twikoo-wrap'), loadTwikoo)
    else loadTwikoo(true)
  } else {
    window.loadOtherComment = () => {
      loadTwikoo()
    }
  }
})()</script></div><script defer src="//lib.baomitu.com/jquery/3.5.1/jquery.min.js"></script><script defer src="https://myhkw.cn/api/player/160561664166" id="myhk" key="160561664166" m="1"></script><div><canvas id="snow" style="position:fixed;top:0;left:0;width:100%;height:100%;z-index:99999;pointer-events:none"></canvas></div><script>const notMobile = (!(navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)));</script><scrip async type="text/javascript" src="https://cdn.jsdelivr.net/gh/Candinya/Kratos-Rebirth@latest/source/js/snow.min.js"></scrip><scrip defer src="https://cdn.jsdelivr.net/npm/hexo-theme-volantis@latest/source/js/issues.min.js"></scrip><script async data-pjax src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script><script>var gitcalendar = new Vue({
  el: '#gitcalendar',
  data: {
    simplemode: true, 
    user: 'xiaoliblog',
    fixed: 'fixed',
    px: 'px',
    x: '',
    y: '',
    span1: '',
    span2: '',
    month: ['一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月'],
    monthchange: [],
    oneyearbeforeday: '',
    thisday: '',
    amonthago: '',
    aweekago: '',
    weekdatacore: 0,
    datacore: 0,
    total: 0,
    datadate: '',
    data: [],
    positionplusdata: [],
    firstweek: [],
    lastweek: [],
    beforeweek: [],
    thisweekdatacore: 0,
    mounthbeforeday: 0,
    mounthfirstindex: 0,
    crispedges: 'crispedges',
    thisdayindex: 0,
    amonthagoindex: 0,
    amonthagoweek: [],
    firstdate: [],
    first2date: [],
    montharrbefore: [],
    monthindex: 0,
    color: ['#ebedf0', '#f1f8ff', '#dbedff', '#c8e1ff', '#79b8ff', '#2188ff', '#0366d6', '#005cc5', '#044289', '#032f62', '#05264c']
  },
  methods: {
    selectStyle(data, event) {
      document.querySelector('.angle-wrapper').style.display = 'block'
      this.span1 = data.date;
      this.span2 = data.count;
      this.x = event.clientX - 100;
      this.y = event.clientY - 60
    },
    outStyle() {
      document.querySelector('.angle-wrapper').style.display = 'none'
    },
    thiscolor(x) {
      if (x === 0) {
        let i = parseInt(x / 2);
        return this.color[0]
      } else if (x < 2) {
        return this.color[1]
      } else if (x < 20) {
        let i = parseInt(x / 2);
        return this.color[i]
      } else {
        return this.color[9]
      }
    },
  }
});
var apiurl = 'python-github-calendar-api-ruby.vercel.app' ? 'https://python-github-calendar-api-ruby.vercel.app/api?' : 'https://githubapi.ryanchristian.dev/user/'
var githubapiurl = apiurl + gitcalendar.user;
//canvas绘图
function responsiveChart() {
  let c = document.getElementById("gitcanvas");
  if (c) {
    let cmessage = document.getElementById("gitmessage");
    let ctx = c.getContext("2d");
    c.width = document.getElementById("gitcalendarcanvasbox").offsetWidth;
    let linemaxwitdh = 0.96 * c.width / gitcalendar.data.length;
    c.height = 9 * linemaxwitdh;
    let lineminwitdh = 0.8 * linemaxwitdh;
    let setposition = {
      x: 0.02 * c.width,
      y: 0.025 * c.width
    };
    for (let week in gitcalendar.data) {
      weekdata = gitcalendar.data[week];
      for (let day in weekdata) {
        let dataitem = {
          date: "",
          count: "",
          x: 0,
          y: 0
        };
        gitcalendar.positionplusdata.push(dataitem);
        ctx.fillStyle = gitcalendar.thiscolor(weekdata[day].count);
        setposition.y = Math.round(setposition.y * 100) / 100;
        dataitem.date = weekdata[day].date;
        dataitem.count = weekdata[day].count;
        dataitem.x = setposition.x;
        dataitem.y = setposition.y;
        ctx.fillRect(setposition.x, setposition.y, lineminwitdh, lineminwitdh);
        setposition.y = setposition.y + linemaxwitdh
      };
      setposition.y = 0.025 * c.width;
      setposition.x = setposition.x + linemaxwitdh
    };
    ctx.font = "600  Arial";
    ctx.fillStyle = '#aaa';
    ctx.fillText("日", 0, 1.9 * linemaxwitdh);
    ctx.fillText("二", 0, 3.9 * linemaxwitdh);
    ctx.fillText("四", 0, 5.9 * linemaxwitdh);
    ctx.fillText("六", 0, 7.9 * linemaxwitdh);
    let monthindexlist = c.width / 24;
    for (let index in gitcalendar.monthchange) {
      ctx.fillText(gitcalendar.monthchange[index], monthindexlist, 0.7 * linemaxwitdh);
      monthindexlist = monthindexlist + c.width / 12
    };
    cmessage.onmousemove = function(event) {
      document.querySelector('.angle-wrapper').style.display = 'none'
    };
    c.onmousemove = function(event) {
      document.querySelector('.angle-wrapper').style.display = 'none'
      getMousePos(c, event);
    };

    function getMousePos(canvas, event) {
      var rect = canvas.getBoundingClientRect();
      var x = event.clientX - rect.left * (canvas.width / rect.width);
      var y = event.clientY - rect.top * (canvas.height / rect.height);
      //console.log("x:"+x+",y:"+y);
      for (let item of gitcalendar.positionplusdata) {
        let lenthx = x - item.x;
        let lenthy = y - item.y;
        //console.log(lenthx,lenthy);
        if (0 < lenthx && lenthx < lineminwitdh) {
          if (0 < lenthy && lenthy < lineminwitdh) {
            //console.log(item.date,item.count)
            document.querySelector('.angle-wrapper').style.display = 'block'
            gitcalendar.span1 = item.date;
            gitcalendar.span2 = item.count;
            gitcalendar.x = event.clientX - 100;
            gitcalendar.y = event.clientY - 60
          }
        }
        //if(0< x - item.x <lineminwitdh&&0< y - item.y <lineminwitdh){
        //console.log(item.count,item.date);
        //}
      }
    }
  }
}
//数据统计算法
function addlastmonth() {
  if (gitcalendar.thisdayindex === 0) {
    thisweekcore(52);
    thisweekcore(51);
    thisweekcore(50);
    thisweekcore(49);
    thisweekcore(48);
    gitcalendar.thisweekdatacore += gitcalendar.firstdate[6].count;
    gitcalendar.amonthago = gitcalendar.firstdate[6].date
  } else {
    thisweekcore(52);
    thisweekcore(51);
    thisweekcore(50);
    thisweekcore(49);
    thisweek2core();
    gitcalendar.amonthago = gitcalendar.first2date[gitcalendar.thisdayindex - 1].date
  }
};

function thisweek2core() {
  for (let i = gitcalendar.thisdayindex - 1; i < gitcalendar.first2date.length; i++) {
    gitcalendar.thisweekdatacore += gitcalendar.first2date[i].count
  }
};

function thisweekcore(index) {
  for (let item of gitcalendar.data[index]) {
    gitcalendar.thisweekdatacore += item.count
  }
};

function addlastweek() {
  for (let item of gitcalendar.lastweek) {
    gitcalendar.weekdatacore += item.count
  }
};

function addbeforeweek() {
  for (let i = gitcalendar.thisdayindex; i < gitcalendar.beforeweek.length; i++) {
    gitcalendar.weekdatacore += gitcalendar.beforeweek[i].count
  }
};

function addweek(data) {
  if (gitcalendar.thisdayindex === 6) {
    gitcalendar.aweekago = gitcalendar.lastweek[0].date;
    addlastweek()
  } else {
    lastweek = data.contributions[51];
    gitcalendar.aweekago = lastweek[gitcalendar.thisdayindex + 1].date;
    addlastweek();
    addbeforeweek()
  }
}

fetch(githubapiurl)
  .then(data => data.json())
  .then(data => {
    gitcalendar.data = data.contributions;
    gitcalendar.total = data.total;
    gitcalendar.first2date = gitcalendar.data[48];
    gitcalendar.firstdate = gitcalendar.data[47];
    gitcalendar.firstweek = data.contributions[0];
    gitcalendar.lastweek = data.contributions[52];
    gitcalendar.beforeweek = data.contributions[51];
    gitcalendar.thisdayindex = gitcalendar.lastweek.length - 1;
    gitcalendar.thisday = gitcalendar.lastweek[gitcalendar.thisdayindex].date;
    gitcalendar.oneyearbeforeday = gitcalendar.firstweek[0].date;
    gitcalendar.monthindex = gitcalendar.thisday.substring(5, 7) * 1;
    gitcalendar.montharrbefore = gitcalendar.month.splice(gitcalendar.monthindex, 12 - gitcalendar.monthindex);
    gitcalendar.monthchange = gitcalendar.montharrbefore.concat(gitcalendar.month);
    addweek(data);
    addlastmonth();
    responsiveChart();
  })
  .catch(function(error) {
    console.log(error);
  });

//手机版更换为svg绘制
if (document.getElementById("gitcalendarcanvasbox").offsetWidth < 500) {
  gitcalendar.simplemode = false
}

//当改变窗口大小时重新绘制canvas
window.onresize = function() {
  if (gitcalendar.simplemode) responsiveChart()
}

//解决滚动滑轮时出现的标签显示
window.onscroll = function() {
  if (document.querySelector('.angle-wrapper')) {
    document.querySelector('.angle-wrapper').style.display = 'none'
  }
};</script></div><script src="/live2dw/lib/L2Dwidget.min.js?094cbace49a39548bed64abff5988b05"></script><script>L2Dwidget.init({"pluginRootPath":"live2dw/","pluginJsPath":"lib/","pluginModelPath":"assets/","tagMode":false,"log":false,"model":{"jsonPath":"/live2dw/assets/hijiki.model.json"},"display":{"position":"right","width":150,"height":300},"mobile":{"show":true},"react":{"opacity":0.7}});</script></body></html>